Which of the following structures is homologous to the wing of a bird?

• Wing of a moth

• Hind limb of a rabbit

• Flipper of whale

• Flipper of whale

Following are the two statements regarding the origin of life

I. The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
II. The first autotrophic organisms were the chemoautotrophs that never released oxygen.

Of the above statement which one of the following options is correct?

• II is correct but I is false

• Both I and II are correct

• Both I and II are false

• Both I and II are false

The process by which organisms with different evolutionary history evolve similar to a common environmental challenge is called 

• natural selection

• convergent evolution

• non-random evolution

• non-random evolution

The tendency of population to remain in genetic equilibrium may be disturbed by

• random mating

• lack of migration

• lack of mutations

• lack of mutations

According to Darwin, the organic evolution is due to

• intraspecific competition

• interspecific competition

• competition within closely related species

• competition within closely related species

Select the wrong statement:

• the viroids were discovered by D.J. Ivanowski

• W.M. Stanley showed that viruses could be crystallized

• The term 'contagium vivum fluidum' was conined by M.W. Beijerinek

• The term 'contagium vivum fluidum' was conined by M.W. Beijerinek

The wings of a bird and the wings of an insect are:

• homologous structures and represent divergent evolution

• analogous structures and represent convergent evolution

• phylogenetic structures and represent divergent evolution

• phylogenetic structures and represent divergent evolution

178.

Industrial melanism is an example of

• Neo Darwinism

• Natural selection

• Mutation

• Mutation

Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as

• Adaptive radiation

• Natural selection

• Migration

• Migration

• Convergent Evolution	Divergent Evolution
  Eyes of Octopus and mammals	Bones of forelimbs of vertebrates

• Convergent Evolution	Divergent Evolution
  Thorns of Bougainvillia and tendrils of Cucurbita	Wings of butterflies and birds

• Convergent Evolution	Divergent Evolution
  Bones of forelimbs of vertebrates	Wings of butterfly and birds

• Convergent Evolution	Divergent Evolution
  Bones of forelimbs of vertebrates	Wings of butterfly and birds